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Rain , driven by the wind , falls on a railway compartment with a velocity of 20m/s , at an angle of 300 to the vertical .The train moves along the direction of wind flow , at a speed of 108km/hr.Determine the apparent velocity of rain for a person sitting in the train....

I know itss a easy one..but nt striking in my mind at present..plzz helpp..!!

 It's very easy . Just consider the rain velocity and trains velocity as two vectors,  Train's Velocity would be along horizontal and negative vector and rain's velocity as vertical and positive.

Now, Apparent or Visual Speed of rain for a person sitting inisde the train would be √202+(-30)2=√1300=36.05 m/s

Hope it helps

Cheers!!!@Keep Smiling!!

  • -9
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This is nt the ans. Guru...ans is 10root7 km/hr..!!!

  • -11

 Then , It must be done according to Parallelogram law of Vector addition, . It will be R=√202+(-30)2-2.20.30 cos (90-30)

=> R= √700=10√7 m/s and not km/h. i hope it helps you!!

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R=√202+(-30)2-2.20.30 cos (90-30) => R= √700=10√7 m/s
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